What is the request limit for the real-time / delayed REST API?
The real-time/delayed REST API has rate limit of 100 requests per second across all the API endpoints. Each API endpoint has a limit on how many symbols can be queried per request. Please see below chart for more details.
Equities
| API Endpoint | Max Symbols per Request |
| Last Sale | 100 |
| Last Trade | 100 |
| Last Quote | 100 |
| Snapshot | 100 |
| Trends | N/A. No Symbol input needed. |
| Bars | 50 |
Options
| API Endpoint | Max Symbols per Request |
| Chain | 1 |
| Prices | 1 |
| Nasdaq Options Greeks and Implied Volatility | 1 |
Indexes
| API Endpoint | Max Symbols per Request |
| Values | 100 |
| Snapshot | 100 |
Exchange Traded Products (ETPs)
| API Endpoint | Max Symbols per Request |
| Values | 100 |
| Snapshot | 100 |
Reference
| API Endpoint | Max Symbols per Request |
| All Symbols | N/A. No Symbol input needed. |
| Symbol Details | 1 |
| All Indexes | N/A. No Symbol input needed. |
| Index Details | 1 |
| Index Participants | 1 |
| All ETPs | N/A. No Symbol input needed. |
| ETP Details | 1 |
| Option Contracts | 1 |